Pressure regulator



1927- a. w. ENGsfRoM PRESSURE REGULATOR Filed Dec, 24, 1921 2Sheets-Sheet 2 A "EV/A my 'Zram,

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Patented Jan. 11, 1927.

UNITED STATES PATENT OFFICE.

GUSTAF W. ENGSTROM, OF RIVERSIDE, ILLINOIS, ASSIGNOR TO INTERNATIONALHAR- VESTER COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF NEW JERSEY.

PRESSURE REGULATOR.

Application filed. December 24, 1921.

My invention relates to pressure regulators, and particularly to adevice adapted to regulate the pressure in a flash or semi-flash boilersuch as used on motor vehicles. Boilers of this class are usuallyprovided with a pilot burner that burns continuously, and a main fuelburner which is automatically turned on or ofi' as the boiler pressurefalls below or rises above predetermined limits.

One of the objects of my invention is to to openand close at any desiredpoint within a wide range of pressures.

Another very important object is to provide a pressure regulator thatwill be actuated in one direction when the boiler pressure reaches apredetermined limit, but will not be actuated in the opposite directionuntil another predetermined limit has been reached.

Still another object is to provide a pressure regulator in which avariable resistance acts on a movable member in opposition to the boilerpressure in such a. manner that the movable member will be held in oneextreme position by the variable resistance un til the boiler pressurereaches a predetermined maximum sufiicient to overcome the resistanceand actuate the movable member, and that as the movable member isactuated the resistance decreases so that the member is not returned toinitial position until the boiler pressure has dropped to apredetermined minimum.

With the above and other objects in view, which will be apparent as thespecification proceeds, reference will now be had to the accompanyingdrawings for a description. of my invention embodied in What I now"believe to be its best form.

Figure 1 is a sectional view taken subs'tan Serial No. 524,568.

tially on the line 1-1 of Fig. 2, showing a preferred form of theinvention;

Fig. 2 is a side elevation, partly 1n section, of Fig. 1;

Fig. 3 is a section on the line 3-3 of Fig. 4 showing a modified form;

Fig. 4 is a side elevation, partly in section, of Fig. 3;

Fig. 5 is a section on the line 55 of Fig. 4;.

My pressure regulator has a hollow body formed integral with a laterallyprojecting cylinder 11, one end of which is secured to a casing orhollow frame 12 in which the operative mechanism is housed. One wall 13of the casing is removable to give access to the interior while theopposite wall supports two knife-edge bearings 14, 15 for a purpose tobe described later. A piston 16 fits closely in the cylinder, one endextending into'the housing where it engages a plunger 17 slidablymounted in a guide 18, the other end of the plunger having an eye 19adapting it for connection to the main fuel burner valve or othermechanism to be controlled. The plunger has a flange 2O for limiting itsmovement in one direction, and an adjustable collar 21 to limit itsmovement in the opposite direction. Near the inner end of the plunger isa clamp 22 having two seats engaged by knife-edge bearings on the springseats or heads 23, 24:. Opposite the knife edge, each spring seat has ashort extension or boss seating in one end of a coil spring 25, 26, theopposite end of the spring seating on an adjusting nut 27, 28screwthreaded on the adjusting screws 29, 30, which have bearings on thethe pivots 14, 15. In operation the pressure regulator is mounted ontheframe of the motor vehicle in any convenient manner, preferably bymeans of bolts passing through the lugs 31, 32. The lunger is connectedto the main burner throttle valve, and the pipe 33 is con nected to theboiler at one end, the other end being connected to the body by abushing 3A having a drain plug 35 and a small orifice 36 communicatingwith the hollow body, which is filled with oil. A filling plug 37provides a means for filling the body with oil, while a similar plug 38in alignment with the cylinder 11 permits ready removal. ofghe piston16.

eternally, the parts occupy the position a the pressure ot the springsresolved par-.

allel to the axis of the piston will equal the maximum boiler pressureon the head of the piston. It now the boiler pre ure is below theallowable maximum the parts will remain stationary and the main fuelburner fully open, but when the pressure ieaches or exceeds thismaximum, the pressure transmitted through pipe 33 and the oil in thebody 10 ill force the piston and plunger to the left a ainst the tensionor the'springs and shut oil the burner. Ji hen the plunger moves to theleft the springs 35 26 will be slightly compressed, but owing to theirinclination the component of their pressure parallel to the axis oi thepiston will decrease so that the further the piston moves to the lettthesmaller will be the absolute pressure required to retain it in thatposition. Consequently, when the boiler presii ure becomes high enoughto start the piston toward the left it will come to rest only when thestop 21 strikes the guide 18, and will not return until the pressure hasdropped a considerable amount or to a pre determined minimum.

T his construction has a decided advantage in that the movement of thepiston is sudden and to the full extent of its stroke in bothdirections. By adjusting the nuts the load on the springs 25, 26 will bevaried, and the pressures at which the piston moves correspondinglychanged.

In the modil'ication sh wn in Figures 3 to 5, a triangular trame e0 hasa flanged cylinder 4-1 secured thereto by bolts 4-2, a hol low body dbbeing formed integral with the cylinder. The trame is bored in alignmentwith the cylinder to receive a. guide ii for a plunger 45, one end ofwhich is adaptl at 46 tor eon ection to the main burner Ct: valve and atthe other end slides in the cylinder in contact with the piston l t. Theplunger carries two adjustable steps 48, 4-5) for limiting itsn'ioven'ient in opposite directions, and a clamp 50 having a pair ofwings drilled to receive pivot pins 51, 52 tor connection to springseats or heads 53, 5-l. The spring seats are drilled to form guides forthe reduced ends of the adjusting screws .55, 5(3 pivotally mounted onthe main frame, and carrying adjusting nuts 57, 58 engaging one end ofthe springs (30, the opposite ends of which bear on the seats 53, 54-.The bodvel?) has a filling plug 61 on one si e, and directly opposite isa bushing- =32 to the pipe leading to the boiler or other source ofpressure.

The modification just described operates in the same manner as thepreferred form of having a drain plug 63 and connected my invention, itditi'ering only in details of constructioi'i.

ll'hile .l have described my pressure regulator as particularly adaptedfor the control of boiler pressures, it is of course of much widerapplication and may be used for regulating pressures in many arts, andis capable o'l many modifications in for i and mode (it operationwithout departing from the spirit or my invention.

ll hat 1 claim as new and desire to protect by Lett rs Patent is:

l. in a pressure regulator, the '(flillllllllik tion of a closed liquidcontaining caning connected to a source of pressure, a pressureresponsive element exposed at one end to t liquid in the casing; andmovable thereby LLKI/ upon ariation oi pressijire in'the pressuresource, and a control member directly connected to the pressureresponsive element embodying means outside of said casing interposingavariable "resistance to the pressui e responsive element.

55. In a tiressure regulator, the combination ot a closed liquidcontaining rising connected to a source of pressure, apressureresponsive element exposed at one end to the liquid in the casing andmovable thereby upon variation of pressure in'the pressure source, and acontrol member directly connected to the pressure responsive elementembodying means outside of the casing inlerposing a variable resistanceto the pressure responsive element, the resistance de creasing withmovement of the element in response to a higher pressure and increasingwith movement of the element in response to a lower pressure.

3. In a pressure regulator, tile combination of a closedliquid'containing casing connected to a source of pressure, a pressureresponsive element exposedat one end to the liquid in the casine'andmovable thereby upon variation o'l pressure in the pressure source, anda control member directly connected to and in line with the pressureresponsi've element embodying means outside of the casing inlerposing avariable resistance to the pressure responsive element, the resistancebeing a minimum when the'piessure respons ve element has moved to oneextreme position in response to a maximum pressure and a niaximun'i whenthe element has moved to its other extreme positioirin response to aniininium pressure.

4. ln ap ressure regulator, the cmnbination of a closed liquidcontaining casing connected to a boiler, a pressure responsive elementexposed at one end to the liquid in the casing and movable thereby uponvariation in boiler pressure, a control member directly connected to andin line with the pressure responsive element, a varying re sistanceoutside of said casing acting on the control member in opposition to theboiler loo ill)

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pressure, and means whereby the resistance decreases as the member movesin opposition thereto and increases as the member moves in accordtherewith.

5. In a pressure regulator, the combination of a closed liquidcontaining casing connected to a boiler, an elongated member exposed atone end to the liquid in the casing and movable thereby upon variationin boiler pressure, a plunger engaging the other end of the member andextending axially thereof, a variable resistance member outside of thecasing and angularly disposed with respect to the plunger and pressingthereon in opposition to the boiler pressure on the movable member, andmeans at the outer end of the elongated member for connecting it to amember to be controlled.

6. In a pressure regulator, the combination of a cylinder, a pistonfreely slidable in the cylinder, a closed liquid containing casingcommunicating with a boiler, the piston being exposed to the liquid inthe casing, a pair of angularly disposed yielding members on oppositesides of the piston and arranged outside of the casing, and means fortransmitting the pressure of the yieldable members to the piston inopposition to the boiler pressure.

7. In a pressure regulator, the combination of a frame, a cylindermounted thereon, means including a liquid containing casing forconnecting the cylinder to a boiler, a piston in the cylinder exposed atone end to the liquid in the casing, a plunger slidable in the frame andengaging the piston, angularly disposed adjusting screws mounted on theframe, and springs carried by the adjusting screws and forcing theplunger toward the piston in opposition to the boiler pressure.

8. in a pressure regulator, the combination of a hollow liquidcontaining body having an integral cylindrical extension, the body beingconnected to a boiler, a frame on which the extension is mounted, apiston slidable in the extension and exposed to the liquid, :1 plungerengaging the piston, a pair of adjusting screws pivotally mounted on theframe on opposite sides of the plun er and inclined toward the piston,sprii mounted on the adjusting screws, and means for transmitting thepressure of the springs to the plunger.

9. In a pressure regulator, the combination of a liquid containinghollow body hav .ing a cylinder and adapted for connection to a boiler,a frame on which the cylinder is mounted, a piston slidable in thecylinder and exposed to the liquid in the body, a plunger engaging thepiston, a pair of adjusting screws pivotally mounted on tne frame onopposite sides of the plunger and inclined toward the piston, springsmounted on the adjusting screws, means for trans mitting the pressure ofthe springs to the plunger, and means for varying the tension springsmounted on the adjusting screws,

and a plunger in axial alinement with the piston for transmitting thepressure of the springs to the piston.

11. In a pressure regulator, the combination of a frame having aplurality of bearings, a plunger slidable therein and having apluralityof bearings, adjusting screws engaging the hearings on theframe and inclined with respect to the plunger, heads engaging thebearings on the plunger, springs on the adjusting screws engaging theheads, and means acted on by the'boiler pressure in opposition to thepressure of the springs.

12. A pressure controlled regulator comprising a pair of casings, acylinder connecting the casings, one of said casings containing a liquidand connected to a source of pressure, a piston slidable in the cylinderand exposed to the liquid in said casing, and

vaive controlling means including a plunger in axial alinement with thepiston and housed in the other casing and actuable by the fluid mediumand piston upon increase of pressure in the pressure source.

13. A pressure controlled regulator comprising a pair of casings, acylinder connecting the casings, one of said casings containing a liquidand connected to a source of pressure, a movable member slidable in thecylinder and the other casing and exposed to the liquid in the liquidcontaining easing, yield-able members in said other casing, said movablemember comprising a valve controiling means actuable by change ofpressure in the pressure source communicated through the liquid in theliquid containing casing and. against the resistance of the yieldablemembers.

v1 1. A pressure controlled regulator comprisin a pair of casings, acylinder connecting the casings, one of said casings containing a liquidand connected to a source of pressure, a movable member slidable in thecylinder and. the other casing and exposed at one end to the liquid inthe liquid containing casing, said movable member com prising a valvecontrolling means at its other end, a variable resistance in the othercasing acting on the movable member intermedlateiy of its ends, andmeans whereby the resistance decreases as the movable memher moves inopposition thereto and increases as the member moves in accordtherewith, the movement of the member being rcsponsive to pressurechanges in the pressure source communicated through the liquid in theliquid containing casing.

15. A pressure controlled regulator c0mprising a pair of casings acylinder connecting the casings one of said casings containing a liquidand connected to a source of pressure, a movable member slidable in thecylinder and other casing and exposed at one end to the liquid in theliquid containing 'asing, said movable member comprising a valvecontrolling means at its other end, a 15 pair of angularly disposedyieldable members on opposite sides of the movable member intermediatelyof the ends thereof, and means for transmitting the force exerted by theyieldable members to the movable memher in opposition to the pressureexerted by the pressure source communicated through the liquid in theliquid containing easing.

In testimony whereof I afiix my signature.

GUSTAF \V. ENGSTROM.

